atkstreamablecontent.h

The ATK library provides a set of interfaces for accessibility.By supporting the ATK interfaces, an

/* ATK -  Accessibility Toolkit
 * Copyright 2001 Sun Microsystems Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#if defined(ATK_DISABLE_SINGLE_INCLUDES) && !defined (__ATK_H_INSIDE__) && !defined (ATK_COMPILATION)
#error "Only <atk/atk.h> can be included directly."
#endif

#ifndef __ATK_STREAMABLE_CONTENT_H__
#define __ATK_STREAMABLE_CONTENT_H__

#include <atk/atkobject.h>

G_BEGIN_DECLS

#define ATK_TYPE_STREAMABLE_CONTENT           (atk_streamable_content_get_type ())
#define ATK_IS_STREAMABLE_CONTENT(obj)        G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_STREAMABLE_CONTENT)
#define ATK_STREAMABLE_CONTENT(obj)           G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_STREAMABLE_CONTENT, AtkStreamableContent)
#define ATK_STREAMABLE_CONTENT_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), ATK_TYPE_STREAMABLE_CONTENT, AtkStreamableContentIface))

#ifndef _TYPEDEF_ATK_STREAMABLE_CONTENT
#define _TYPEDEF_ATK_STREAMABLE_CONTENT
typedef struct _AtkStreamableContent AtkStreamableContent;
#endif
typedef struct _AtkStreamableContentIface AtkStreamableContentIface;

struct _AtkStreamableContentIface
{
  GTypeInterface parent;

  /*
   * Get the number of mime types supported by this object
   */
  gint                      (* get_n_mime_types)  (AtkStreamableContent     *streamable);
  /*
   * Gets the specified mime type supported by this object.
   * The mime types are 0-based so the first mime type is 
   * at index 0, the second at index 1 and so on.  The mime-type
   * at index 0 should be considered the "default" data type for the stream.
   *
   * This assumes that the strings for the mime types are stored in the
   * AtkStreamableContent. Alternatively the G_CONST_RETURN could be removed
   * and the caller would be responsible for calling g_free() on the
   * returned value.
   */
  G_CONST_RETURN gchar*     (* get_mime_type)     (AtkStreamableContent     *streamable,
                                                   gint                     i);
  /*
   * One possible implementation for this method is that it constructs the
   * content appropriate for the mime type and then creates a temporary
   * file containing the content, opens the file and then calls
   * g_io_channel_unix_new_fd().
   */
  GIOChannel*               (* get_stream)        (AtkStreamableContent     *streamable,
                                                   const gchar              *mime_type);

/*
 * Returns a string representing a URI in IETF standard format
 * (see http://www.ietf.org/rfc/rfc2396.txt) from which the object's content
 * may be streamed in the specified mime-type.
 * If mime_type is NULL, the URI for the default (and possibly only) mime-type is
 * returned.
 *
 * returns NULL if the mime-type is not supported, or if no URI can be 
 * constructed.  Note that it is possible for get_uri to return NULL but for
 * get_stream to work nonetheless, since not all GIOChannels connect to URIs.
 */
    G_CONST_RETURN  gchar*  (* get_uri)           (AtkStreamableContent     *streamable,
                                                   const gchar              *mime_type);


  AtkFunction               pad1;
  AtkFunction               pad2;
  AtkFunction               pad3;
};
GType                  atk_streamable_content_get_type (void);

gint                   atk_streamable_content_get_n_mime_types (AtkStreamableContent     *streamable);
                                                       
G_CONST_RETURN gchar*  atk_streamable_content_get_mime_type    (AtkStreamableContent     *streamable,
                                                                gint                     i);
GIOChannel*             atk_streamable_content_get_stream       (AtkStreamableContent     *streamable,
                                                                 const gchar              *mime_type);

gchar*                  atk_streamable_content_get_uri          (AtkStreamableContent     *streamable,
                                                                 const gchar              *mime_type);

G_END_DECLS

#endif /* __ATK_STREAMABLE_CONTENT_H__ */